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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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d0941130c9
There are multiple ICMP rate limiting mechanisms: * Global limits: net.ipv4.icmp_msgs_burst/icmp_msgs_per_sec * v4 per-host limits: net.ipv4.icmp_ratelimit/ratemask * v6 per-host limits: net.ipv6.icmp_ratelimit/ratemask However, when ICMP output is limited, there is no way to tell which limit has been hit or even if the limits are responsible for the lack of ICMP output. Add counters for each of the cases above. As we are within local_bh_disable(), use the __INC stats variant. Example output: # nstat -sz "*RateLimit*" IcmpOutRateLimitGlobal 134 0.0 IcmpOutRateLimitHost 770 0.0 Icmp6OutRateLimitHost 84 0.0 Signed-off-by: Jamie Bainbridge <jamie.bainbridge@gmail.com> Suggested-by: Abhishek Rawal <rawal.abhishek92@gmail.com> Link: https://lore.kernel.org/r/273b32241e6b7fdc5c609e6f5ebc68caf3994342.1674605770.git.jamie.bainbridge@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
320 lines
10 KiB
C
320 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* This file implements the various access functions for the
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* PROC file system. This is very similar to the IPv4 version,
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* except it reports the sockets in the INET6 address family.
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*
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* Authors: David S. Miller (davem@caip.rutgers.edu)
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* YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
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*/
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#include <linux/socket.h>
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#include <linux/net.h>
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#include <linux/ipv6.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/stddef.h>
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#include <linux/export.h>
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#include <net/net_namespace.h>
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#include <net/ip.h>
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#include <net/sock.h>
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#include <net/tcp.h>
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#include <net/udp.h>
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#include <net/transp_v6.h>
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#include <net/ipv6.h>
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#define MAX4(a, b, c, d) \
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max_t(u32, max_t(u32, a, b), max_t(u32, c, d))
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#define SNMP_MIB_MAX MAX4(UDP_MIB_MAX, TCP_MIB_MAX, \
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IPSTATS_MIB_MAX, ICMP_MIB_MAX)
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static int sockstat6_seq_show(struct seq_file *seq, void *v)
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{
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struct net *net = seq->private;
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seq_printf(seq, "TCP6: inuse %d\n",
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sock_prot_inuse_get(net, &tcpv6_prot));
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seq_printf(seq, "UDP6: inuse %d\n",
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sock_prot_inuse_get(net, &udpv6_prot));
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seq_printf(seq, "UDPLITE6: inuse %d\n",
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sock_prot_inuse_get(net, &udplitev6_prot));
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seq_printf(seq, "RAW6: inuse %d\n",
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sock_prot_inuse_get(net, &rawv6_prot));
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seq_printf(seq, "FRAG6: inuse %u memory %lu\n",
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atomic_read(&net->ipv6.fqdir->rhashtable.nelems),
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frag_mem_limit(net->ipv6.fqdir));
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return 0;
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}
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static const struct snmp_mib snmp6_ipstats_list[] = {
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/* ipv6 mib according to RFC 2465 */
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SNMP_MIB_ITEM("Ip6InReceives", IPSTATS_MIB_INPKTS),
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SNMP_MIB_ITEM("Ip6InHdrErrors", IPSTATS_MIB_INHDRERRORS),
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SNMP_MIB_ITEM("Ip6InTooBigErrors", IPSTATS_MIB_INTOOBIGERRORS),
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SNMP_MIB_ITEM("Ip6InNoRoutes", IPSTATS_MIB_INNOROUTES),
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SNMP_MIB_ITEM("Ip6InAddrErrors", IPSTATS_MIB_INADDRERRORS),
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SNMP_MIB_ITEM("Ip6InUnknownProtos", IPSTATS_MIB_INUNKNOWNPROTOS),
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SNMP_MIB_ITEM("Ip6InTruncatedPkts", IPSTATS_MIB_INTRUNCATEDPKTS),
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SNMP_MIB_ITEM("Ip6InDiscards", IPSTATS_MIB_INDISCARDS),
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SNMP_MIB_ITEM("Ip6InDelivers", IPSTATS_MIB_INDELIVERS),
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SNMP_MIB_ITEM("Ip6OutForwDatagrams", IPSTATS_MIB_OUTFORWDATAGRAMS),
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SNMP_MIB_ITEM("Ip6OutRequests", IPSTATS_MIB_OUTPKTS),
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SNMP_MIB_ITEM("Ip6OutDiscards", IPSTATS_MIB_OUTDISCARDS),
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SNMP_MIB_ITEM("Ip6OutNoRoutes", IPSTATS_MIB_OUTNOROUTES),
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SNMP_MIB_ITEM("Ip6ReasmTimeout", IPSTATS_MIB_REASMTIMEOUT),
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SNMP_MIB_ITEM("Ip6ReasmReqds", IPSTATS_MIB_REASMREQDS),
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SNMP_MIB_ITEM("Ip6ReasmOKs", IPSTATS_MIB_REASMOKS),
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SNMP_MIB_ITEM("Ip6ReasmFails", IPSTATS_MIB_REASMFAILS),
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SNMP_MIB_ITEM("Ip6FragOKs", IPSTATS_MIB_FRAGOKS),
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SNMP_MIB_ITEM("Ip6FragFails", IPSTATS_MIB_FRAGFAILS),
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SNMP_MIB_ITEM("Ip6FragCreates", IPSTATS_MIB_FRAGCREATES),
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SNMP_MIB_ITEM("Ip6InMcastPkts", IPSTATS_MIB_INMCASTPKTS),
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SNMP_MIB_ITEM("Ip6OutMcastPkts", IPSTATS_MIB_OUTMCASTPKTS),
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SNMP_MIB_ITEM("Ip6InOctets", IPSTATS_MIB_INOCTETS),
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SNMP_MIB_ITEM("Ip6OutOctets", IPSTATS_MIB_OUTOCTETS),
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SNMP_MIB_ITEM("Ip6InMcastOctets", IPSTATS_MIB_INMCASTOCTETS),
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SNMP_MIB_ITEM("Ip6OutMcastOctets", IPSTATS_MIB_OUTMCASTOCTETS),
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SNMP_MIB_ITEM("Ip6InBcastOctets", IPSTATS_MIB_INBCASTOCTETS),
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SNMP_MIB_ITEM("Ip6OutBcastOctets", IPSTATS_MIB_OUTBCASTOCTETS),
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/* IPSTATS_MIB_CSUMERRORS is not relevant in IPv6 (no checksum) */
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SNMP_MIB_ITEM("Ip6InNoECTPkts", IPSTATS_MIB_NOECTPKTS),
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SNMP_MIB_ITEM("Ip6InECT1Pkts", IPSTATS_MIB_ECT1PKTS),
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SNMP_MIB_ITEM("Ip6InECT0Pkts", IPSTATS_MIB_ECT0PKTS),
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SNMP_MIB_ITEM("Ip6InCEPkts", IPSTATS_MIB_CEPKTS),
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SNMP_MIB_SENTINEL
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};
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static const struct snmp_mib snmp6_icmp6_list[] = {
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/* icmpv6 mib according to RFC 2466 */
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SNMP_MIB_ITEM("Icmp6InMsgs", ICMP6_MIB_INMSGS),
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SNMP_MIB_ITEM("Icmp6InErrors", ICMP6_MIB_INERRORS),
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SNMP_MIB_ITEM("Icmp6OutMsgs", ICMP6_MIB_OUTMSGS),
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SNMP_MIB_ITEM("Icmp6OutErrors", ICMP6_MIB_OUTERRORS),
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SNMP_MIB_ITEM("Icmp6InCsumErrors", ICMP6_MIB_CSUMERRORS),
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SNMP_MIB_ITEM("Icmp6OutRateLimitHost", ICMP6_MIB_RATELIMITHOST),
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SNMP_MIB_SENTINEL
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};
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/* RFC 4293 v6 ICMPMsgStatsTable; named items for RFC 2466 compatibility */
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static const char *const icmp6type2name[256] = {
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[ICMPV6_DEST_UNREACH] = "DestUnreachs",
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[ICMPV6_PKT_TOOBIG] = "PktTooBigs",
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[ICMPV6_TIME_EXCEED] = "TimeExcds",
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[ICMPV6_PARAMPROB] = "ParmProblems",
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[ICMPV6_ECHO_REQUEST] = "Echos",
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[ICMPV6_ECHO_REPLY] = "EchoReplies",
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[ICMPV6_MGM_QUERY] = "GroupMembQueries",
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[ICMPV6_MGM_REPORT] = "GroupMembResponses",
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[ICMPV6_MGM_REDUCTION] = "GroupMembReductions",
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[ICMPV6_MLD2_REPORT] = "MLDv2Reports",
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[NDISC_ROUTER_ADVERTISEMENT] = "RouterAdvertisements",
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[NDISC_ROUTER_SOLICITATION] = "RouterSolicits",
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[NDISC_NEIGHBOUR_ADVERTISEMENT] = "NeighborAdvertisements",
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[NDISC_NEIGHBOUR_SOLICITATION] = "NeighborSolicits",
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[NDISC_REDIRECT] = "Redirects",
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};
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static const struct snmp_mib snmp6_udp6_list[] = {
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SNMP_MIB_ITEM("Udp6InDatagrams", UDP_MIB_INDATAGRAMS),
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SNMP_MIB_ITEM("Udp6NoPorts", UDP_MIB_NOPORTS),
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SNMP_MIB_ITEM("Udp6InErrors", UDP_MIB_INERRORS),
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SNMP_MIB_ITEM("Udp6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
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SNMP_MIB_ITEM("Udp6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
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SNMP_MIB_ITEM("Udp6SndbufErrors", UDP_MIB_SNDBUFERRORS),
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SNMP_MIB_ITEM("Udp6InCsumErrors", UDP_MIB_CSUMERRORS),
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SNMP_MIB_ITEM("Udp6IgnoredMulti", UDP_MIB_IGNOREDMULTI),
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SNMP_MIB_ITEM("Udp6MemErrors", UDP_MIB_MEMERRORS),
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SNMP_MIB_SENTINEL
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};
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static const struct snmp_mib snmp6_udplite6_list[] = {
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SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
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SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
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SNMP_MIB_ITEM("UdpLite6InErrors", UDP_MIB_INERRORS),
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SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
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SNMP_MIB_ITEM("UdpLite6RcvbufErrors", UDP_MIB_RCVBUFERRORS),
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SNMP_MIB_ITEM("UdpLite6SndbufErrors", UDP_MIB_SNDBUFERRORS),
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SNMP_MIB_ITEM("UdpLite6InCsumErrors", UDP_MIB_CSUMERRORS),
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SNMP_MIB_ITEM("UdpLite6MemErrors", UDP_MIB_MEMERRORS),
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SNMP_MIB_SENTINEL
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};
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static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, atomic_long_t *smib)
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{
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char name[32];
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int i;
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/* print by name -- deprecated items */
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for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
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int icmptype;
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const char *p;
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icmptype = i & 0xff;
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p = icmp6type2name[icmptype];
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if (!p) /* don't print un-named types here */
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continue;
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snprintf(name, sizeof(name), "Icmp6%s%s",
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i & 0x100 ? "Out" : "In", p);
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seq_printf(seq, "%-32s\t%lu\n", name,
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atomic_long_read(smib + i));
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}
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/* print by number (nonzero only) - ICMPMsgStat format */
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for (i = 0; i < ICMP6MSG_MIB_MAX; i++) {
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unsigned long val;
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val = atomic_long_read(smib + i);
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if (!val)
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continue;
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snprintf(name, sizeof(name), "Icmp6%sType%u",
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i & 0x100 ? "Out" : "In", i & 0xff);
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seq_printf(seq, "%-32s\t%lu\n", name, val);
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}
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}
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/* can be called either with percpu mib (pcpumib != NULL),
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* or shared one (smib != NULL)
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*/
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static void snmp6_seq_show_item(struct seq_file *seq, void __percpu *pcpumib,
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atomic_long_t *smib,
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const struct snmp_mib *itemlist)
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{
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unsigned long buff[SNMP_MIB_MAX];
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int i;
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if (pcpumib) {
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memset(buff, 0, sizeof(unsigned long) * SNMP_MIB_MAX);
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snmp_get_cpu_field_batch(buff, itemlist, pcpumib);
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for (i = 0; itemlist[i].name; i++)
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seq_printf(seq, "%-32s\t%lu\n",
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itemlist[i].name, buff[i]);
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} else {
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for (i = 0; itemlist[i].name; i++)
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seq_printf(seq, "%-32s\t%lu\n", itemlist[i].name,
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atomic_long_read(smib + itemlist[i].entry));
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}
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}
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static void snmp6_seq_show_item64(struct seq_file *seq, void __percpu *mib,
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const struct snmp_mib *itemlist, size_t syncpoff)
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{
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u64 buff64[SNMP_MIB_MAX];
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int i;
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memset(buff64, 0, sizeof(u64) * SNMP_MIB_MAX);
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snmp_get_cpu_field64_batch(buff64, itemlist, mib, syncpoff);
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for (i = 0; itemlist[i].name; i++)
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seq_printf(seq, "%-32s\t%llu\n", itemlist[i].name, buff64[i]);
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}
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static int snmp6_seq_show(struct seq_file *seq, void *v)
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{
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struct net *net = (struct net *)seq->private;
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snmp6_seq_show_item64(seq, net->mib.ipv6_statistics,
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snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
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snmp6_seq_show_item(seq, net->mib.icmpv6_statistics,
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NULL, snmp6_icmp6_list);
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snmp6_seq_show_icmpv6msg(seq, net->mib.icmpv6msg_statistics->mibs);
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snmp6_seq_show_item(seq, net->mib.udp_stats_in6,
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NULL, snmp6_udp6_list);
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snmp6_seq_show_item(seq, net->mib.udplite_stats_in6,
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NULL, snmp6_udplite6_list);
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return 0;
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}
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static int snmp6_dev_seq_show(struct seq_file *seq, void *v)
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{
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struct inet6_dev *idev = (struct inet6_dev *)seq->private;
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seq_printf(seq, "%-32s\t%u\n", "ifIndex", idev->dev->ifindex);
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snmp6_seq_show_item64(seq, idev->stats.ipv6,
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snmp6_ipstats_list, offsetof(struct ipstats_mib, syncp));
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snmp6_seq_show_item(seq, NULL, idev->stats.icmpv6dev->mibs,
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snmp6_icmp6_list);
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snmp6_seq_show_icmpv6msg(seq, idev->stats.icmpv6msgdev->mibs);
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return 0;
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}
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int snmp6_register_dev(struct inet6_dev *idev)
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{
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struct proc_dir_entry *p;
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struct net *net;
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if (!idev || !idev->dev)
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return -EINVAL;
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net = dev_net(idev->dev);
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if (!net->mib.proc_net_devsnmp6)
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return -ENOENT;
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p = proc_create_single_data(idev->dev->name, 0444,
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net->mib.proc_net_devsnmp6, snmp6_dev_seq_show, idev);
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if (!p)
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return -ENOMEM;
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idev->stats.proc_dir_entry = p;
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return 0;
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}
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int snmp6_unregister_dev(struct inet6_dev *idev)
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{
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struct net *net = dev_net(idev->dev);
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if (!net->mib.proc_net_devsnmp6)
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return -ENOENT;
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if (!idev->stats.proc_dir_entry)
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return -EINVAL;
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proc_remove(idev->stats.proc_dir_entry);
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idev->stats.proc_dir_entry = NULL;
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return 0;
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}
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static int __net_init ipv6_proc_init_net(struct net *net)
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{
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if (!proc_create_net_single("sockstat6", 0444, net->proc_net,
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sockstat6_seq_show, NULL))
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return -ENOMEM;
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if (!proc_create_net_single("snmp6", 0444, net->proc_net,
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snmp6_seq_show, NULL))
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goto proc_snmp6_fail;
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net->mib.proc_net_devsnmp6 = proc_mkdir("dev_snmp6", net->proc_net);
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if (!net->mib.proc_net_devsnmp6)
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goto proc_dev_snmp6_fail;
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return 0;
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proc_dev_snmp6_fail:
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remove_proc_entry("snmp6", net->proc_net);
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proc_snmp6_fail:
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remove_proc_entry("sockstat6", net->proc_net);
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return -ENOMEM;
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}
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static void __net_exit ipv6_proc_exit_net(struct net *net)
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{
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remove_proc_entry("sockstat6", net->proc_net);
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remove_proc_entry("dev_snmp6", net->proc_net);
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remove_proc_entry("snmp6", net->proc_net);
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}
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static struct pernet_operations ipv6_proc_ops = {
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.init = ipv6_proc_init_net,
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.exit = ipv6_proc_exit_net,
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};
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int __init ipv6_misc_proc_init(void)
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{
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return register_pernet_subsys(&ipv6_proc_ops);
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}
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void ipv6_misc_proc_exit(void)
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{
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unregister_pernet_subsys(&ipv6_proc_ops);
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}
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